2109685 has 8 divisors (see below), whose sum is σ = 2573496. Its totient is φ = 1659840.

The previous prime is 2109671. The next prime is 2109697. The reversal of 2109685 is 5869012.

It can be written as a sum of positive squares in 4 ways, for example, as 18769 + 2090916 = 137^2 + 1446^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2109685 - 2¹⁵ = 2076917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3154 + ... + 3763.

It is an arithmetic number, because the mean of its divisors is an integer number (321687).

2^2109685 is an apocalyptic number.

It is an amenable number.

2109685 is a deficient number, since it is larger than the sum of its proper divisors (463811).

2109685 is an equidigital number, since it uses as much as digits as its factorization.

2109685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6983.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 2109685 is about 1452.4754731148. The cubic root of 2109685 is about 128.2544782713.

The spelling of 2109685 in words is "two million, one hundred nine thousand, six hundred eighty-five".